标题： 关于系外行星射电辐射所需的质量 显示英文标题

标题： On the required mass for exoplanetary radio emission

摘要： 检测来自系外行星的无线电发射将是确定其磁场的最佳方法。 确实，通过回旋脉泽不稳定性产生无线电发射需要行星磁场的存在。 然而，磁场的存在并不足够。 在发射区域，局部回旋频率必须相对于局部等离子体频率足够高。 由于对低质量行星的强烈恒星照射可能导致扩展的行星大气层，磁层等离子体频率取决于行星质量、轨道距离及其母恒星。 我们表明，扩展的行星大气层可以抑制无线电发射。 这似乎尤其适用于质量小于大约两个木星质量且轨道距离低于$\sim$0.2 天文单位的重要一部分行星。 由无线电比例定律提出的大多数最佳候选者都位于这个参数空间中。 考虑到这种抑制效应将对观测活动的目标选择产生重要影响。 同时，这种效应也将对观测数据的解释产生影响。 显示英文摘要

摘要： The detection of radio emission from an exoplanet would constitute the best way to determine its magnetic field. Indeed, the presence of a planetary magnetic field is a necessary condition for radio emission via the Cyclotron Maser Instability. The presence of a magnetic field is, however, not sufficient. At the emission site, the local cyclotron frequency has to be sufficiently high compared to the local plasma frequency. As strong stellar insolation on a low-mass planet can lead to an extended planetary atmosphere, the magnetospheric plasma frequency depends on the planetary mass, its orbital distance, and its host star. We show that an extended planetary atmosphere can quench the radio emission. This seems to be true, in particular, for an important fraction of the planets less massive than approximately two Jupiter masses and with orbital distances below $\sim$0.2 AU. Most of the best candidates suggested by radio scaling laws lie in this parameter space. Taking this effect quenching into account will have important implications for the target selection of observation campaigns. At the same time, this effect will have consequences for the interpretation of observational data.